Abstract: A chemical applicator for a pet door includes a substantially wedge shaped body defining a chemical reservoir therebetween. The wedge shaped body presents a ramped transition between the surface of the pet door above the chemical applicator and the front of the chemical applicator being devoid of substantial sharp edges of protrusions that may otherwise strike the pet or snag a collar of the pet as the pet brushes past the applicator. The front of the applicator includes a slit having a planar wick therethrough and therealong, the wick extending through the slit so as to define an interior portion for being soaked by a liquid chemical within the reservoir and an exterior chemical application portion. In use, as the pet brushes past the pet door and the chemical application portion rubs across the hide of the pet, applying the liquid chemical thereon.

Abstract: An egg search code, that can be used for accurately searching history information of an egg using a number of digits printable on the egg, is assigned to the egg, and the history information of the egg can be accurately identified based on the egg search code assigned to the egg. An unused egg search code out of the totality of egg search codes is determined and will be used as the egg search code to be assigned to the egg. The determined egg search code is assigned to all eggs having identical history information. The egg search code assigned to the egg is related to the egg history code and an egg collection date code, and is stored. The egg history code related to the egg collection date code and the egg search code is searched for, in compliance with a provision request, submitted from a consumer terminal, for history information, the provision request containing the egg collection date code and/or the egg search code.